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Apress Introducing dot NET 4 0 with Visual Studio 2010_2

Nếu bạn muốn làm việc với một ví dụ thực tế hơn, hãy xem các ví dụ từ nhóm song song, bạn sẽ tìm thấy ray tracing tuyệt vời và các ví dụ liên quan đến toán học khác. Lưu ý rằng gọi Thread.Sleep () sẽ liên quan đến một chuyển ngữ cảnh (một hoạt động đắt tiền cho CPU), vì vậy nó có thể làm chậm các ứng dụng mẫu xuống nhiều hơn so với thực hiện công việc có thể có. | CHAPTER 5 PARALLELIZATION AND THREADING ENHANCEMENTS factorials or walk trees of data but I think this distracts at least initially from understanding the basics. If you want to work with a more realistic example take a look at the examples from the parallel team you will find excellent ray tracing and other math related examples. Note that calling the Thread.Sleep method will involve a context switch an expensive operation for the CPU so it might slow the sample application down more than performing work might have. 1. Create a new console application called Chapter5.HelloParalleland add the following using directives using System.Diagnostics using System.Threading.Tasks 2. Amend Program.cs to the following code class Program . . public static List StockQuote Stocks new List StockQuote static void Main string args . double serialSeconds 0 double parallelSeconds 0 Stopwatch sw new Stopwatch PopulateStockList sw Stopwatch.StartNew RunInSerial serialSeconds sw.Elapsed.TotalSeconds sw Stopwatch.StartNew RunInParallel parallelSeconds sw.Elapsed.TotalSeconds Console.WriteLine Finished serial at 0 and took 1 DateTime.Now serialSeconds Console.WriteLine Finished parallel at 0 and took 1 DateTime.Now parallelSeconds Console.ReadLine private static void PopulateStockList Stocks.Add new StockQuote ID 1 Stocks.Add new StockQuote ID 2 Stocks.Add new StockQuote ID 3 Stocks.Add new StockQuote ID 4 Stocks.Add new StockQuote ID 5 Stocks.Add new StockQuote ID 6 Company Microsoft Price 5.34m Company IBM Price 1.9m Company Yahoo Price 2.34m Company Google Price 1.54m Company Altavista Price 4.74m Company Ask Price 3.21m 102 CHAPTER 5 PARALLELIZATION AND THREADING ENHANCEMENTS Stocks.Add new StockQuote ID 7 Company Amazon Price 20.8m Stocks.Add new StockQuote ID 8 Company HSBC Price 54.6m Stocks.Add new StockQuote ID 9 Company Barclays Price 23.2m Stocks.Add new StockQuote ID 10 Company Gilette Price 1.84m private static void RunInSerial for int i 0 i Stocks.Count i 7 . . .